[129282] in North American Network Operators' Group
Re: Q-In-Q using M7i and CISCO Switch
daemon@ATHENA.MIT.EDU (sthaug@nethelp.no)
Wed Sep 1 02:35:06 2010
Date: Wed, 01 Sep 2010 08:34:55 +0200 (CEST)
To: giulianocm@uol.com.br
From: sthaug@nethelp.no
In-Reply-To: <4C7D9D63.7090901@uol.com.br>
Cc: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
> We have a client with the following situation:
>
> v1, v2, v3
> -------| Switch | ----------| Switch |----------------|
> Switch|------------- JUNIPER M7i IQ2E -----
>
>
> Carrier offers only 3 vlans to the client. But he wants to push some
> more vlans inside the 3 ones.
>
> It is possible to initiate and finish Q-In-Q vlans using a cisco ME
> switch and a JUNIPER M7i with IQ2E interface ?
>
> The following link shows stack configuration. It can be used to do
> Q-In-Q with this situation ?
>
> http://www.juniper.com.lv/techpubs/en_US/junos10.0/information-products/topic-collections/config-guide-network-interfaces/id-12155750.html
>
>
> Someone tries to configure it any time ?
You need to differentiate between *terminating* a dual tagged VLAN, and
the operation of pushing/popping a VLAN tag. M7i with IQ2E kan do either.
Note that you are *not* guaranteed that a carrier which offers a VLAN
transport service will automatically handle dual tagged VLANs - this must
be verified. Note also the obvious MTU implication of a 4 byte additional
VLAN tag.
You might be better off discussing this on the juniper-nsp list.
Steinar Haug, Nethelp consulting, sthaug@nethelp.no
